Eventually fix:
===============
- Fix overlay to always be on top (probably canvas2d or something)

Nice additions:
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- Create particle sprite for fire and lightning
- Make projectile fade after hitting an object

Most important:
===============
- **DONE** Work on level 2 setup
- **DONE** Implement scorpion movement
- **DONE** Give scorpions customizable starting directions
- **DONE** Switch command text from richtext to label
- **DONE** Make a lightning sprite
- **DONE** Have player shoot lightning
- **DONE** Make lightning kill scorpions
- **DONE** Make lightning disappear after killing scorpions
- **DONE** Set the noise of lightning striking a scorpion
- **DONE** Learn to make particles
- **DONE** Spruce up levels 1 and 2
- Make music for during levels
- Draw a sprite for solid grey brick
- Create a tile for solid grey brick
- Work on level 3 setup
- Have player shoot waterspray
- Make waterspray destroy rocks
- Make this the first really challenging level
- Figure out a good evaporate mechanic
- Work on level 4 setup
- Work on first boss: Big scorpion

